CVE-2026-22609 Fickling has Static Analysis Bypass via Incomplete Dangerous Module Blocklist
Attackers can bypass Fickling's static analysis to execute arbitrary code via malicious pickles importing unblocked dangerous modules.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-22609?
CVE-2026-22609 is a high-severity unsafe deserialization vulnerability in trailofbits fickling, published on 10 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Fickling is a Python pickling decompiler and static analyzer. Prior to version 0.1.7, the unsafe_imports() method in Fickling's static analyzer fails to flag several high-risk Python modules that can be used for arbitrary code execution. Malicious pickles importing these modules will not be detected as unsafe, allowing attackers to bypass Fickling's primary static safety checks. This issue has been patched in version 0.1.7.
Which versions are affected by CVE-2026-22609?
3 open source packages ship an affected version, including fickling. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
fickling PyPI | All versions | 0.1.7 |
fickling PyPI | All versions | 0.1.7 |
fickling PyPI | All versions | 0.1.7 |
Products include Trailofbits Fickling.
How do I fix CVE-2026-22609?
Upgrade fickling to 0.1.7 or later.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-22609 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-22609 exists.
Other vulnerabilities in trailofbits fickling
- CVE-2026-22606 Fickling has a bypass via runpy.run_path() and runpy.run_module()
- CVE-2026-22607 Fickling Blocklist Bypass: cProfile.run()
- CVE-2026-22608 Fickling vulnerable to use of ctypes and pydoc gadget chain to bypass detection
- CVE-2026-22612 Fickling vulnerable to detection bypass due to "builtins" blindness
- CVE-2026-14534 Fickling check_safety() bypass via unlisted standard library modules (_posixsubprocess, site, atexit)
Sources
Also known as GHSA-q5qq-mvfm-j35x, PYSEC-2026-1372.